package filesys import ( "context" "fmt" "math" "sync" "time" "bazil.org/fuse" "bazil.org/fuse/fs" "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/pb/filer_pb" "github.com/chrislusf/seaweedfs/weed/util" "github.com/karlseguin/ccache" "google.golang.org/grpc" ) type Option struct { FilerGrpcAddress string FilerMountRootPath string Collection string Replication string TtlSec int32 ChunkSizeLimit int64 DataCenter string DirListingLimit int EntryCacheTtl time.Duration } var _ = fs.FS(&WFS{}) var _ = fs.FSStatfser(&WFS{}) type WFS struct { option *Option listDirectoryEntriesCache *ccache.Cache // contains all open handles handles []*FileHandle pathToHandleIndex map[string]int pathToHandleLock sync.Mutex stats statsCache } type statsCache struct { filer_pb.StatisticsResponse lastChecked int64 // unix time in seconds } func NewSeaweedFileSystem(option *Option) *WFS { return &WFS{ option: option, listDirectoryEntriesCache: ccache.New(ccache.Configure().MaxSize(int64(option.DirListingLimit) + 200).ItemsToPrune(100)), pathToHandleIndex: make(map[string]int), } } func (wfs *WFS) Root() (fs.Node, error) { return &Dir{Path: wfs.option.FilerMountRootPath, wfs: wfs}, nil } func (wfs *WFS) withFilerClient(fn func(filer_pb.SeaweedFilerClient) error) error { return util.WithCachedGrpcClient(func(grpcConnection *grpc.ClientConn) error { client := filer_pb.NewSeaweedFilerClient(grpcConnection) return fn(client) }, wfs.option.FilerGrpcAddress) } func (wfs *WFS) AcquireHandle(file *File, uid, gid uint32) (fileHandle *FileHandle) { wfs.pathToHandleLock.Lock() defer wfs.pathToHandleLock.Unlock() fullpath := file.fullpath() index, found := wfs.pathToHandleIndex[fullpath] if found && wfs.handles[index] != nil { glog.V(4).Infoln(fullpath, "found fileHandle id", index) return wfs.handles[index] } if found && wfs.handles[index] != nil { glog.V(4).Infoln(fullpath, "reuse previous fileHandle id", index) wfs.handles[index].InitializeToFile(file, uid, gid) fileHandle.handle = uint64(index) return } fileHandle = newFileHandle(file, uid, gid) for i, h := range wfs.handles { if h == nil { wfs.handles[i] = fileHandle fileHandle.handle = uint64(i) wfs.pathToHandleIndex[fullpath] = i glog.V(4).Infoln(fullpath, "reuse fileHandle id", fileHandle.handle) return } } wfs.handles = append(wfs.handles, fileHandle) fileHandle.handle = uint64(len(wfs.handles) - 1) glog.V(4).Infoln(fullpath, "new fileHandle id", fileHandle.handle) wfs.pathToHandleIndex[fullpath] = int(fileHandle.handle) return } func (wfs *WFS) ReleaseHandle(fullpath string, handleId fuse.HandleID) { wfs.pathToHandleLock.Lock() defer wfs.pathToHandleLock.Unlock() glog.V(4).Infof("%s releasing handle id %d current handles length %d", fullpath, handleId, len(wfs.handles)) delete(wfs.pathToHandleIndex, fullpath) if int(handleId) < len(wfs.handles) { wfs.handles[int(handleId)] = nil } return } // Statfs is called to obtain file system metadata. Implements fuse.FSStatfser func (wfs *WFS) Statfs(ctx context.Context, req *fuse.StatfsRequest, resp *fuse.StatfsResponse) error { glog.V(4).Infof("reading fs stats: %+v", req) if wfs.stats.lastChecked < time.Now().Unix()-20 { err := wfs.withFilerClient(func(client filer_pb.SeaweedFilerClient) error { request := &filer_pb.StatisticsRequest{ Collection: wfs.option.Collection, Replication: wfs.option.Replication, Ttl: fmt.Sprintf("%ds", wfs.option.TtlSec), } glog.V(4).Infof("reading filer stats: %+v", request) resp, err := client.Statistics(ctx, request) if err != nil { glog.V(0).Infof("reading filer stats %v: %v", request, err) return err } glog.V(4).Infof("read filer stats: %+v", resp) wfs.stats.TotalSize = resp.TotalSize wfs.stats.UsedSize = resp.UsedSize wfs.stats.FileCount = resp.FileCount wfs.stats.lastChecked = time.Now().Unix() return nil }) if err != nil { glog.V(0).Infof("filer Statistics: %v", err) return err } } totalDiskSize := wfs.stats.TotalSize usedDiskSize := wfs.stats.UsedSize actualFileCount := wfs.stats.FileCount // Compute the total number of available blocks resp.Blocks = totalDiskSize / blockSize // Compute the number of used blocks numblocks := uint64(usedDiskSize / blockSize) // Report the number of free and available blocks for the block size resp.Bfree = resp.Blocks - numblocks resp.Bavail = resp.Blocks - numblocks resp.Bsize = uint32(blockSize) // Report the total number of possible files in the file system (and those free) resp.Files = math.MaxInt64 resp.Ffree = math.MaxInt64 - actualFileCount // Report the maximum length of a name and the minimum fragment size resp.Namelen = 1024 resp.Frsize = uint32(blockSize) return nil }